With more code to write than time to write it, I'm a huge fan of anything that helps me code.
Someone recently sent me a link to Home Tomato's Visual AssistX for Visual Studio.
This is a great example of how the 3rd party ecosystem makes the .NET platform great for developers.
I'd type a list of features here but the list is HUGE.
Instead, check it out here http://www.wholetomato.com/products/default.asp
Personal Licence is $99